Automatic ventilating window-lock.



No. 699,204. Patented May 6, |902.

W. C. MARTIN.

AUTDMAZTIC VENTILATING WINDOW LCK.

(Application filed Jan. 15, 1902.)

(No Model.) 2 Sheets-Sheet 2.

UNIT/153D STATES PATENT @turca VILLIAM C. MARTIN, NEWTON, MASSACHUSETTS.

AUTOMATIC VENTILATING WINDOW-LOCK.

SPECIFICATION forming part of Letters Patent No. 699,204, dated May 6, 1902.

Application filed January 15, 1902, Serial No. 89,831. (No model.)

To a/ZZ whom t may conceive." v j Beit known that I, WILLIAM C. MARTIN, a

citizen of the United States, and a resident of Newton, in the county of Middlesex and State of Massachusetts, have invented certain newand useful Improvements in Automatic Ventilating Window-Locks, of which the following is a specification.

The object of this invention is to produce a Ventilating window-lock whereby the upper and the lower sash may be locked together so that either sash may be partially opened and only partially, and when the Ventilating-look is unlocked and either sash is fully opened it will be automatically locked again by closing the sash.

y An additional fastenei` of any kind which when locked will prevent the window from being opened at all kmay be employed, if desired; but such a lock has no connection with this invention.

The invention will now be fully described,

and the novel features thereof will be par-Y ticularly pointed out in the claims at the close of'this speciication.

In the drawings, Figure 1 is a perspective view showing a portion of a window-casing and of an upper and a lower sash having Iattached theretoa device embodying the invention, the window being closed and the ventilating-lock being locked. Fig. 2 is a side elevation, partly in section. Fig. 3 is a longitudinal section through the bolt-casing.

Referring now to the drawings, 1 represents the upper sash, 2 the lower sash, and 3 the side casing, of a window. On the top of the lower sash is the bolt-@asin g4, which is form edV with a base 5, by which it is secured to the sash. It is located near the end of the rail, so that the bolt may engage with the lock-plate on the side bar of the upper sash. Within the casing 4 is a bolt 6, having a lever 7, which projects through the guide-slot 8. Behind the bolt is a spring 9, which normally holds the bolt in its forward Vposition for locking, as in Fig. 1. Formed in the front face of the side bar of the upper sash is a grooved recess 17. Secured to the front face of the side bar over the said recess is a lock-plate 10, having lengthwise thereof a slot 11, which is enlarged at the lower end. The head 13 of the bolt is of such size or shape that it can be movedinto or out of the slot 11 only where the passage is enlarged, as at 12. The bolt is formed with a neck 14, narrow enough to pass through the narrow part of the slot, so

Tthat' when the bolt is in its locking position which is opposite the neck of the bolt when the'bolt is drawn back. A spring 29, secured at its forward end to the base 5 of the boltcasing or to the top of the sash 2, extends rearwardly alongside the bolt-casing and is :formed with a projecting loop 15, which when the bolt is drawn back from engagement with jthe lock-plate to bring the neck of the bolt jopposi'te the slot 3l willl lie in the slot, where `it will engage the shoulder 16 and prevent the bolt from being shot forward byits spring 9. The preferred method of securing the lspring29 to the sash is by a staple 30 driven Athrough holes in the plate and into the topV rail of the sash. The free end of the spring 29 is formed, preferably, with a bent arm 19, which lies in the path of a tripping device attached to the upper sash.

The tripping device consists of a spring 18, 'secured within the recess back of the lockplate and having a projecting portion which extends through the slot 32 in the lock-plate in such manner as to engage with the arm 19 of the spring-catch 29.

Preferably the tripping-spring 18 is formed of spring-wire doubled back on itself at 20, forming two arms, with the bent end downward. The rear arm is made fast at its upper end, preferably to the rear face of the lock-plate, as by bending the upper end and passing it through a holein the lock-plate at 2 and riveting it down, and alsobya staple 23, which is riveted. The upper end of the front arm is free. The front arm is formed with a hump having a shoulder 25, which forms the trip, the upper side of the shoulderzbeing substantially square and the lower side 26 sloping rearwardly, so that when either the upper sash is lowered or the lower sash is raised [CO s.

while the bolt is held retracted by the springcatch 29 the catch-arm 1I) will ride over the sloping portion 26 of the trip-spring, which will yield to allow the passage without trippingthe catch-springl; but when the opened sash is closed again the square side of the shoulder will engage with the arm 19 of the catch and raise the catch out of engagement with the shoulder 16 of the bolt, leaving the bolt free to respond to the action of the spring 9 as soon as the window is closed, so as to bring the head of the bolt against the enlarged portion 12 of the slot in the lock-plate.

As the catch-spring 29 is yielding, after it has been raised high enough to be tripped by the hump on the trip-spring the continued closing movement of the window will release the trip-arm from engagement with the catcharm, so that the stop project-ion 15 on the catch-spring will then be ready to rcngage the shoulder 16 ol the bolt when the bolt is again retracted.

In the usual construction of windows the top rail of the lower sash is formed with a rearward extension or bead 27. In order to prevent the shoulder 25 of the trip-spring from engaging with this bead, it is preferable to form the trip-spring with a second hump 2l above the shoulder 25, which slopes rearwardly on both the upper and thelower sides, so that this hump will engage the bead 27 in advance of the trip-hump and allow the triphump to pass without interference.

In order to prevent easy drilling through the sash from the outside, so as to gain access to the bolt when locked, it is preferable to protect the rear part of the locking recess opposite the bolt with a steel plate 2S.

l. Awindow-fasteningcoxnprisingaspringactuated bolt mounted in a casing secured to the top of the lower sash, a catch which when said bolt is retracted automatically engages the bolt and holds it retracted until said catch is tripped, a lock-plate on the upper sash which is adapted to be engaged by said bolt which can enter or withdraw from vthe lock-plate only when both sashes are closed, and a tripping device for said catch consisting of a doubled spring-wire forming two arms, the end of one arm being secured on the back side of the lock-plate, the other arm being formed with a hump which projects through a slot in the lock-plate and which is so formed that when either sash is opened the said projection will not trip said catch, and by the operation of closing either sash the catch will be tripped, substantially as described.

2. Awindow-fastening,comprisingaspringactuated bolt mounted in a casing secured to the top of the lower sash, a catch which when said bolt is retracted engages the bolt, a slotted lock-plate on the side rail ot' the upper sash and a tripping device for said catch consisting of a doubled spring-wire forming two arms, the end of one arm being secured at the back of the lock-plate, the other arm being formed with two humps which project through a slot in the lock-plate, said humps being so formed that when either sash is opened neither of the humps will trip said catch and in the operation of closing either sash one of said humps will trip the catch, the other hump serving as a' guard to ward the tripping-hump from engagement with the rear side of the lower sash while the sash is being closed, substantially as described.

In testimony whereof I have axed my signature in presence ot' two witnesses.

WILLIAM C. MARTIN.

Witnesses:

WILLIAM A. COPELAND, ROBERT WALLACE. 

